英语听力：2013-07-21 《恐龙的战争》3 顽强防御—16

Thats a wave of energy that could knock over a predator or at least discombobulate it, scramble its brains. Despite holding a deafening secret weapon, a Parasaurolophus, like other plant eaters, knows that the best way to stay alive is to keep predat

英语听力：2013-07-10 《恐龙的战争》3 顽强防御—11

The number-one concern in life would befeeding the beast. The land is covered in vast forests offerns, pines, and monkey puzzle trees. Many of these plants have almost nonutritional valuel. The hardest job in the animal world, thedinosaur world, was

英语听力：2013-07-12 《恐龙的战争》3 顽强防御—12

...plant material at a time, and were talking about something huge. Surprisingly, it isnt something huge which allows these giant herbivores to grow big enough to be all but invincible. In fact, its something incredibly small, and something meat eate

英语听力：2013-07-14 《恐龙的战争》3 顽强防御—13

the equivalent of a human being with a brain the size of a pea. Lobes for both sight and smell are tiny. Areas controlling information analysis, learning, and complex thought are barely developed. If you look at the size of their brain, you actually

英语听力：2013-07-17 《恐龙的战争》3 顽强防御—14

and interpreting sounds. Its called the auditory cortex. What was a surprise is the higher centers of their brain are very large and suggest that something very different is going on in Parasaurolophus and its kin than in most other of these plant-ea

英语听力：2013-07-19 《恐龙的战争》3 顽强防御—15

This tactic is still used today on the plains of Africa. If you look at various species of plant eaters, they live together in groups, and if one of them spots a predator, they can whinny or hoot and let the rest of the herd know, so that they can ke

英语听力：2013-07-24 《恐龙的战争》3 顽强防御—17

Individually, their huge size is a powerful defense, but sticking together makes these Leviathans almost indestructible. Keeping a herd of 50-ton animals filled up, however, means traveling vast distances, grazing territory covering thousands of squa

英语听力：2013-07-26 《恐龙的战争》3 顽强防御—18

They couldnt see directly behind themselves, and they actually would have problems seeing directly in front of themselves. Its almost a different visual world than one that we can imagine. The Parasaurolophus have a solution to this problem. When you

英语听力：2013-07-28 《恐龙的战争》3 顽强防御—19

populated by millions of odor receptors. Complicated, crazy-straw, tortuous nasal passageway that went from the nostrils, made several loops through the snout before it went down into the throat. Ankylosaurus supersensitive nose can pick up a carnivo

英语听力：2013-07-31 《恐龙的战争》3 顽强防御—20

Probably the only way a T-Rex could successfully and safely bring down Triceratops is by having at least one other individual Tyrannosaur that would ambush it from the back while the one in front is keeping the attention of the Triceratops. Working a

英语听力：2013-07-05 《恐龙的战争》3 顽强防御—9

The tip is designed not the split on impact. It absorbs the stress of all that raw power the hammer gives because its not solid bone. Instead, its honeycombed with soft tissue, marrow, blood and fact. Ankylosaurus combines steel-like protective plate

英语听力：2013-06-19 《恐龙的战争》3 顽强防御—2

These plant eaters are no pushovers. They are no theyre no pansies. We have records, quite a few, of adult dinosaurian predators being killed by herbivores. It did happen. It happens today. Lions get kicked in the face and die from a single blow from

英语听力：2013-06-21 《恐龙的战争》3 顽强防御—3

Triceratops is an amazing animal simply because it was absolutely enormous. They had this big massive body with a big gut. So, you know, we are talking of an animal thats maybe four or five tons. A Triceratops is half as tall as a T-Rex, yet it weigh

英语听力：2013-06-23 《恐龙的战争》3 顽强防御—4

Sometimes they even take on members of their own specie in a battle for dominance. Its primary weapon is a pair of a-meter-long horns mounted on its skull. These horns make those of modern creatures look lightweight. A rhinos horn is made of hair, an

英语听力：2013-06-26 《恐龙的战争》3 顽强防御—5

Here we have one of the greatest predators nature has ever produced and one of the greatest defenders nature has ever produced sparring of with some truly awesome weaponry. Theres nothing like that in the world today. Triceratops most effective defen

英语听力：2013-06-28 《恐龙的战争》3 顽强防御—6

solid armor and dangerous weapons all deliver the power to stand up to huge predators. But in the world of Cretaceous, other defenders come equipped with tools not only to survive an attack but to defeat an opponent. Ankylosaurus is a herbivore desig

英语听力：2013-06-30 《恐龙的战争》3 顽强防御—7

just probably you stay stinking machine walking its way to the forest. Digesting plant fiber is the hardest job. In the eco-system an Ankylosaurus tackle that job, which is why it needed that enormous bulk, gigantic stomach and some divided intestine

英语听力：2013-07-03 《恐龙的战争》3 顽强防御—8

Interwoven layers can absorb the power of a piercing attack. Ankylosaurus pretty much was not afraid of anything because it would be very difficult to kill this beast. This creatures armor protects something else as well, its eyes. The eyelids of an

英语听力：2013-07-07 《恐龙的战争》3 顽强防御—10

19 meters tall and almost 30 meters long. Its neck alone is 4 stories long, a single vertebra almost as tall as a grown man. And a single thighbone weighs over half a ton. They seem to break all of the rules. Theres nothing like them around today. Co

英语听力：2013-06-16 《恐龙的战争》3 顽强防御—1

In a prehistoric world, theres a war waging between herbivores and carnivores, and the plant-eaters are winning. They seem to break all of the rules. Theres nothing like them around today. For these plant-eating giants, survival relies on a battery o